The green-looking fluid is actually a "harmless, food dye" used as a tracer. It helps workers identify the cause of sinkholes, cave-ins and other holes in the ground."We mainly use the green dye as it is the most visible and can be seen at the greatest distance"

Alonjar:The green-looking fluid is actually a "harmless, food dye" used as a tracer. It helps workers identify the cause of sinkholes, cave-ins and other holes in the ground."We mainly use the green dye as it is the most visible and can be seen at the greatest distance"